A source of terrestrial organic carbon to investigate the browning of aquatic ecosystems.

The multiple regression model for color was highly significant (R 2 = 0.84, F 3,110 = 188, P <0.0001), but the slope and intercepts were affected by ecosystem type, which resulted in the following equations: (2) and (3) Despite the differences in the regression parameters, most of the color observations from the experimental ponds fell within the 95% prediction intervals associated with the regression model for natural lakes in equation 3 ( Fig. 2a ).

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(5) This change in BR resulted in a marginally significant decline in bacterial growth efficiency (BGE) along the DOC gradient (r 2 = 0.30, F 1,10 = 3.94, P = 0.079, Fig. 8c ): (6) Discussion In this study, we evaluated a commercially available source of humic substances (Super Hume) for studying the effects of terrestrial DOC on the chemistry, physics, and biology of aquatic ecosystems.

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